<div class="form-group has-feedback">
    <input type="text" class="form-control" name="user" placeholder="用户名">
    <span class="glyphicon glyphicon-user form-control-feedback"></span>
</div>
<div class="form-group has-feedback">
    <input type="password" class="form-control" name="pwd" placeholder="密码">
    <span class="glyphicon glyphicon-lock form-control-feedback"></span>
</div>



